<button class="button">
  <span>Button</span>
  <div class="overlay"></div>
  <div class="shine"></div>
</button>

<style>
/* From Uiverse.io by elijahwgummer-poc - Tags: button, bubble, animated, shine */
.button {
  position: relative;
  display: inline-block;
  padding: 12px 26px;
  font-size: 20px;
  font-weight: bold;
  text-align: center;
  text-decoration: none;
  border-radius: 50px;
  color: #fff;
  background-color: #ff6b6b;
  border: none;
  overflow: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.button span {
  position: relative;
  z-index: 1;
}

.button .overlay {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.button .shine {
  position: absolute;
  top: -80px;
  left: -80px;
  width: 160px;
  height: 160px;
  background: radial-gradient(ellipse at center, rgba(255, 255, 255, 0.8) 0%, transparent 80%);
  transform: rotate(45deg);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.button:hover .overlay {
  opacity: 0.7;
}

.button:hover .shine {
  opacity: 1;
}

.button:hover {
  background-color: #ff3333;
}

.button:active {
  background-color: #cc0000;
}

</style>
